Process of making high-grade viscose products



Patented Sept. 2, 1930 UNITED SAT$ @FFlE ALWIN JAG-ER, OF CHEMNITZ, GERMANY, ASSIGNOR TO THE FIRM OSCAR KOHQBIT & (30., OF CI-IEMNITZ, GERIlIAlTY PROCESS OF MAKING HIGH-GRADE VISGOSE PRODUCTS No Drawing. Application filed October 24, 1928, Serial No. 314,850, and in Germany November 26, 1927.

This invention relates to processes or making high-grade viscose products, especially for spinning purposes, for instance for the manufacture of fine-threaded viscose silk.

In order to modify the properties of viscose-products in a desired manner, in the case of normal spinning baths either the composition or other characteristics of the viscose may be changed or, when employing normal viscose, admixtures may be made to the spinning bath, said admixtures causing a change or variation of the properties of the viscose-thread or band in a desired direction. Thus, for instance, admixtures of art1 iicial resins or other products of condensation, such as neradol or the like are known for this purpose. However, up to the present day there is no knowledge about the manner in which these admixtures to the spinning bath exert an influence upon the properties of the viscose-thread. As a matter of fact only very few organic substances are able to exert a favorable influence when admixed to the spinning bath. Numerous experiments have proven that a favorable effect may be exerted upon the viscose-products by admixing thereto waste-products or substances containing ceratin or gluten, such as for in stance the products gained by the decay or" leather, wool, cartilaginous substance or the like. More particularly, in most cases it is immaterial whether during the decay of these products bases or acids will be developed,

whether said decay is caused by the action of ierments or the like, or whether colloidal solutions of such substances are used. The only requirement as regards the efficiency of these substances consists therein that these substances do not considerably flake out of their solutions. It has further been found that the quantity of such admixtures depends upon the degree of decay of the ceratin or gluten containing substances. Thus, a larger quantity of admixtures will be necessary in case of a larger degree of decay, while the quantity of such admixtures may be smaller, if the decay of these substances has not yet reached a considerable degree. v

By reason of the fact that there exist large quantities of ceratin or gluten containing waste-products which up to the present day cannot be practically utilized, such as for instance waste-products from hides, leather, horn, wool, bones and the like, a process of practically exploiting these products will be connected with considerable economical ad vantages not only as compared with the products so far proposed for admixtures to spinbaths but also as regards the technical riority of the products produced.

I The technical advantage gained by using ad ixtures to spinning bath according to invention consists in the first place in the possibility of making liner vi cose threads, for instance of an individual denier or" l or less. in the second place, the surprising fact has been ascertained that the new admixtures will cause the differences in the degree of maturity of viscose solutions come into action upon the spinning qualities or other qualities of the obtained product to a far smaller degree than is the case when using an ordinary spinning bath. On the other hand it has been ascertained, that by using the admixtures according to myinvention a variation of the temperature of the spinning bath as well as oi the spinning solution will be of considerably smaller effect than with a spinning bath without the new admixtures. Also the properties of the product as regards its ability of being spun will still further be advantageously enhanced by the new admixtures according to my invention'.

The dissolution of some ceratin containing substances, such as for instance wool, in certain dissolving agents, such as for instance diluted sulphuric acid, will be facilitated by previously treating these bodies with metal salts, such as chromic salts, or by directly using waste-products such as leather which had been treated by chromium compounds.

The following may serve as an example for carrying out my new process of making high-grade viscose products.

t iis Example 200 g. of leather treated by chromium compounds are dissolved in about 1 liter of a 10% sulphuric acid at moderate heat and a. concentrated solution of sodium sulphate and sulphuric acid is added to this solution, so that the solution made for the spinning bath will contain about 100200 g. of ceratin contain ing constituents or their waste-products, about 130l50 g. of sodium sulphate and 1301el0 of sulphuric acid per liter.

At a spinning temperature of about 4i5 C. and a speed of 40 m. of the thread, viscose threads 01' 1 denier and less may be made according to the process forming part of my present invention.

I claim:

1. In the process of producing filaments and the like of viscose material, the step of extruding filaments and the like of Viscose material into a setting bath containing a member of the group comprising ceratin and gluten.

2. In the process of producing filaments and the like of viscose material, the step of extruding filaments and the like of viscose material into a setting bath containing 10% ceratin.

3. In the process of producing filaments and the like of viscose material, the step of extruding filaments and the like of viscose material into a setting bath which consists of an acidic bath containing a member from the group comprising gluten and ceratin.

4:. In the process of producing filaments and the like of viscose material, the step of extruding filaments and the like of viscose material into a setting bath which consists of an acid solution containing a mixture of gluten and ceratin.

5. In the process of producing filaments and the like of viscose material, the step of extruding filaments and the like of viscose material into a setting bath in which 10% of a member from the group comprising gluten and ceratin is dissolved in a solution containing sulphuric acid and sodium sulphate.

In testimony whereof I ai my signature.

ALWIN JAGER. 

